DXA measures BMD without what?

Study for the Image Modalities Test. Learn with flashcards and multiple choice questions, each comes with hints and explanations. Get ready for your credentialing exam in the field of medical imaging!

Multiple Choice

DXA measures BMD without what?

Explanation:
DXA uses two-energy X-ray beams to separate bone signal from soft-tissue signal. Because bone and soft tissue attenuate X-rays differently at two energies, the scanner solves for the amount of bone mineral content in a region while accounting for the surrounding soft tissue. The result is an areal BMD value (g/cm^2) that reflects bone density with the soft-tissue contribution effectively removed from the measurement. So, the measurement is made without the influence of soft tissue. Water is a component of soft tissue, air isn’t a meaningful contributor in this context, and bone is what you’re measuring, not what’s excluded.

DXA uses two-energy X-ray beams to separate bone signal from soft-tissue signal. Because bone and soft tissue attenuate X-rays differently at two energies, the scanner solves for the amount of bone mineral content in a region while accounting for the surrounding soft tissue. The result is an areal BMD value (g/cm^2) that reflects bone density with the soft-tissue contribution effectively removed from the measurement. So, the measurement is made without the influence of soft tissue.

Water is a component of soft tissue, air isn’t a meaningful contributor in this context, and bone is what you’re measuring, not what’s excluded.

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